It's not really a 'situation', but nevertheless;
It was Dec 31st, I was at my girlfriends house celebrating New Years. We we're both a lil drunk, she took me upstairs to her bathroom and started giving me head. But at this point it was close to midnight so it got cut short by us having to go downstairs and celebrate 00:00. I could live with this, it wasn't really that big a deal (that's a lie, it was my first experience). But then later that night as she got more drunk she told me she'd cheated on me with another guy that she'd 'been in love' with all along. She said she felt horrible and shit but I didn't care for her niceties, I went home at like 2am, not long after she'd told me, and stayed up all night just getting angrier and angrier at it.
I have this friend, who's birthday is on January the 3rd. And he likes parties, so he had a bash at his house on the 5th. Still very much ridden with shame and all the rest of it and in the "I want her back" stage of a breakup, we both got drunk and again, I received head in the bathroom... Only half, though. My sexual quest was cut short AGAIN due to her being too drunk and disorderly to even stand, let alone go downtown on my crotch.
So for a few weeks, I was built up with anger and jealousy and all the other shit that comes with a break up, and I decide "Fuck it." From that point on I went out of my way to be a total dick to her whenever I could, mostly at college. It kinda built to a confrontation where she asked me angrily what she did wrong. I just said "Cheated on me" and walked off. She caught up with me eventually and tried to convince me how sorry she was. I wasn't having any of it. It ended with me saying "As a human being, you disgust me". Which made her cry, which really was my goal. She hurt me, I hurt her back.
Maybe I AM an asshole for doing it, but I don't care, she led me on when she was really after another guy, and it came and bit her in the ass. I don't believe in Karma, but I guess it fits here.
This was over a year ago, since then, she's poured her heart in apology to me, I begrudgingly accepted. I don't go to college anymore so I don't ever see her, but she talks to me on MSN occasionally, they're civil talks, but VERY tense. Not sexually, just in general.
And thats the story of me and my ex. I'm now with someone else who is far superior, we've been together about 14 months now.